Most accepted theory for ascent of sap is
Sap ascends in woody stems because of root pressure and

Options

A. Transpiration pull
B. Capillarity
C. Molecular adhesion
D. Photosynthesis

Answer

A

Explanation

A pulling force called suction caused by the evaporation of water in a leaf draws a long, continuous column of water through the xylem from the root to the leaf. This is called the transpiration stream.